New15 min read
Tool Calling Under the Hood: Claude Messages vs OpenAI Responses
How tool calling works on the wire: JSON schema tools, parallel calls, tool_choice, strict mode and streaming deltas in Claude Messages vs OpenAI Responses.
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FUNCTION CALLING
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MCP vs A2A vs Function Calling: Which Layer Does What in 2026
MCP vs A2A vs function calling compared on the 2026-07-28 MCP spec and A2A 1.0: what each protocol does, where they overlap, and how to stack them.
•13 min read
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12 min read
Tool Use in the Claude API: Production Patterns for Reliable Agents
Master tool use in the Claude API. Schema design, retry logic, multi-step loops, and the failure modes that only show up at 10k calls a day.
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